Re: Realtime data and (C)AP

2015-10-08 Thread Renato Perini
uot;right" answer because you probably can't even define what that is. On Thu, Oct 8, 2015 at 4:17 PM Renato Perini <mailto:renato.per...@gmail.com>> wrote: How the two things can fit together? Cassandra endorses the AP side of the CAP theorem. So how Cassandra can

Realtime data and (C)AP

2015-10-08 Thread Renato Perini
How the two things can fit together? Cassandra endorses the AP side of the CAP theorem. So how Cassandra can deliver realtime consistent data? AFAIK, choosing a consistency level equals to ALL can be a huge performance hit for C*, so, please, explain me why I should choose C* for realtime data

Re: Cassandra Configuration VS Static IPs.

2015-10-04 Thread Renato Perini
when you reboot machines (I have no idea why you'd do this, AWS definitely doesn't work this way) then I think you're going to hit a whole set of other issues. On Sun, Oct 4, 2015 at 7:10 PM Renato Perini <mailto:renato.per...@gmail.com>> wrote: Yes, the client use

Re: Cassandra Configuration VS Static IPs.

2015-10-04 Thread Renato Perini
be able to connect to the servers from a machine not in your datacenter. How else would you connect to them if you don't provide access? On Sun, Oct 4, 2015 at 6:35 PM Renato Perini <mailto:renato.per...@gmail.com>> wrote: Seems to be not the case when connecting to my

Re: Cassandra Configuration VS Static IPs.

2015-10-04 Thread Renato Perini
s. Where are you running a DC that IPs aren't cheap? If you're in AWS they're basically free (or at least the cheapest section of your bill by far) On Sun, Oct 4, 2015 at 5:59 PM Renato Perini <mailto:renato.per...@gmail.com>> wrote: Is cassandra really

Cassandra Configuration VS Static IPs.

2015-10-04 Thread Renato Perini
Is cassandra really supposed to have a static public IP for each and single node in the cluster? This seems to be expensive (static IPs are nor free neither cheap), still the broadcast_rpc_address expects a static IP for client communications (load balancing, contact points, etc.) Is there some

Re: Cassandra certification

2015-10-02 Thread Renato Perini
What credibility can have a certification with a non disclosure agreement? Il 02/10/2015 19:58, Fernandez Gomara, Ruben (CCI-Atlanta) ha scritto: Thank you all so much for your emails. The link has very useful information. Thanks again Ruben *From:*sean_r_dur...@homedepot.com [mailto:sean_

broadcast address on EC2 without Elastic IPs.

2015-09-30 Thread Renato Perini
Hello! I have configured a small cluster composed of three nodes on Amazon EC2. The 3 machines don't have an elastic IP (static address) so the public address changes at every reboot. I have a machine with a static ip that I use as a bridge to access the other 3 cassandra nodes through SSH. On thi

spark-cassandra-connector not present on Maven Central

2015-09-18 Thread Renato Perini
https://repo1.maven.org/maven2/com/datastax/spark/spark-cassandra-connector-java_2.11/1.5.0-M1/spark-cassandra-connector-java_2.11-1.5.0-M1.jar https://repo1.maven.org/maven2/com/datastax/spark/spark-cassandra-connector_2.11/1.5.0-M1/spark-cassandra-connector_2.11-1.5.0-M1.jar https://repo1.maven

Cassandra - Spark - Flume: best architecture for log analytics.

2015-07-22 Thread Renato Perini
Problem: Log analytics. Solutions: 1) Aggregating logs using Flume and storing the aggregations into Cassandra. Spark reads data from Cassandra, make some computations and write the results in distinct tables, still in Cassandra. 2) Aggregating logs using Flume to a sink, streamin